Campbell Scientific SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer Owner's manual

Brand: Campbell Scientific

Model: SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer

Type: Owner's manual

This manual is also suitable for

SR20-D2

Campbell Scientific SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer measures solar short-wave radiation in a full hemisphere of the sky. Ideal for scientific meteorological observation networks and utility-scale solar-energy-power production sites, it features a built-in case-temperature sensor and embedded heater for removing dew and light rain. It connects directly to Campbell Scientific data loggers and can be installed horizontally or at any angle, including inverted.

11/2018

Campbell Scientific, Inc.

Limited Warranty

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thermocouples, desiccant, and other consumables have no warranty. CSI’s obligation under this

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implied. The warranty for installation services performed by CSI such as programming to cus-

tomer specifications, electrical connections to Products manufactured by CSI, and Product spe-

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Safety

DANGER — MANY HAZARDS ARE ASSOCIATED WITH INSTALLING, USING, MAINTAINING, AND WORKING ON OR AROUND TRIPODS,

TOWERS, AND ANY ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC. FAILURE

TO PROPERLY AND COMPLETELY ASSEMBLE, INSTALL, OPERATE, USE, AND MAINTAIN TRIPODS, TOWERS, AND ATTACHMENTS, AND

FAILURE TO HEED WARNINGS, INCREASES THE RISK OF DEATH, ACCIDENT, SERIOUS INJURY, PROPERTY DAMAGE, AND PRODUCT FAILURE.

TAKE ALL REASONABLE PRECAUTIONS TO AVOID THESE HAZARDS. CHECK WITH YOUR ORGANIZATION'S SAFETY COORDINATOR (OR

POLICY) FOR PROCEDURES AND REQUIRED PROTECTIVE EQUIPMENT PRIOR TO PERFORMING ANY WORK.

Use tripods, towers, and attachments to tripods and towers only for purposes for which they are designed. Do not exceed design limits. Be

familiar and comply with all instructions provided in product manuals. Manuals are available at www.campbellsci.com or by telephoning

(435) 227-9000 (USA). You are responsible for conformance with governing codes and regulations, including safety regulations, and the

integrity and location of structures or land to which towers, tripods, and any attachments are attached. Installation sites should be evaluated

and approved by a qualified engineer. If questions or concerns arise regarding installation, use, or maintenance of tripods, towers, attach-

ments, or electrical connections, consult with a licensed and qualified engineer or electrician.

General

l Prior to performing site or installation work, obtain required approvals and permits. Comply with all governing structure-height reg-

ulations, such as those of the FAA in the USA.

l Use only qualified personnel for installation, use, and maintenance of tripods and towers, and any attachments to tripods and

towers. The use of licensed and qualified contractors is highly recommended.

l Read all applicable instructions carefully and understand procedures thoroughly before beginning work.

l Wear a hardhat and eye protection, and take other appropriate safety precautions while working on or around tripods and towers.

l Do not climb tripods or towers at any time, and prohibit climbing by other persons. Take reasonable precautions to secure tripod

and tower sites from trespassers.

l Use only manufacturer recommended parts, materials, and tools.

Utility and Electrical

l You can be killed or sustain serious bodily injury if the tripod, tower, or attachments you are installing, constructing, using, or main-

taining, or a tool, stake, or anchor, come in contact with overhead or underground utility lines.

l Maintain a distance of at least one-and-one-half times structure height, 20 feet, or the distance required by applicable law,

whichever is greater, between overhead utility lines and the structure (tripod, tower, attachments, or tools).

l Prior to performing site or installation work, inform all utility companies and have all underground utilities marked.

l Comply with all electrical codes. Electrical equipment and related grounding devices should be installed by a licensed and qualified

electrician.

Elevated Work and Weather

l Exercise extreme caution when performing elevated work.

l Use appropriate equipment and safety practices.

l During installation and maintenance, keep tower and tripod sites clear of un-trained or non-essential personnel. Take precautions to

prevent elevated tools and objects from dropping.

l Do not perform any work in inclement weather, including wind, rain, snow, lightning, etc.

Maintenance

l Periodically (at least yearly) check for wear and damage, including corrosion, stress cracks, frayed cables, loose cable clamps, cable

tightness, etc. and take necessary corrective actions.

l Periodically (at least yearly) check electrical ground connections.

WHILE EVERY ATTEMPT IS MADE TO EMBODY THE HIGHEST DEGREE OF SAFETY IN ALL CAMPBELL SCIENTIFIC PRODUCTS, THE CUSTOMER

ASSUMES ALL RISK FROM ANY INJURY RESULTING FROM IMPROPER INSTALLATION, USE, OR MAINTENANCE OF TRIPODS, TOWERS, OR

ATTACHMENTS TO TRIPODS AND TOWERS SUCH AS SENSORS, CROSSARMS, ENCLOSURES, ANTENNAS, ETC.

Table of Contents

1. SR20-D2 introduction 1

2. Installation 1

2.1 Siting 1

2.2 Mounting procedure 1

3. SR20-D2 wiring 3

3. RS-485 default configuration 4

4. SR20-D2 register map 4

5. RS-485 programming 5

6. SR20-D2 example program 5

7. Maintenance and troubleshooting 9

Table of Contents - iv

1. SR20-D2 introduction

The SR20-D2, manufactured by Hukseflux Thermal Sensors, is an ISO 9060 digital secondary-

standard pyranometer that measures solar short-wave radiation in a full hemisphere of the sky. It

has a built-in case-temperature sensor and embedded heater for removing dew and light rain. It

connects directly to Campbell Scientific data loggers and is designed for applications that require

high measurement accuracy in demanding applications such as scientific meteorological obser-

vation networks and utility scale solar-energy-power production sites.

2. Installation

2.1 Siting

The solar radiation sensor is usually installed horizontally, but can also be installed at any angle

including an inverted position. Site the sensor to allow easy access for maintenance while ideally

avoiding any obstructions or reflections above the plane of the sensing element. It is important

to mount the sensor such that a shadow or a reflection will not be cast on it at any time.

If this is not possible, try to choose a site where any obstruction over the azimuth range between

earliest sunrise and latest sunset has an elevation not exceeding 5°. Diffuse solar radiation is less

influenced by obstructions near the horizon. The sensor should be mounted with the cable point-

ing towards the nearest magnetic pole. For example, in the northern hemisphere, point the cable

toward the North Pole.

2.2 Mounting procedure

1. On a level surface, level the solar radiation sensor using the leveling feet on the sensor.

Alternatively, remove the sensor leveling feet to allow it to be mounted directly to the

mounting bracket.

2. Secure the solar radiation sensor to the mounting bracket. The blue dots in the following

figure indicate the mounting holes used for this pyranometer.

SR20-D2 ISO Secondary Standard Pyranometer 1

3. Using a diopter in combination with a solar compass, install and orient the crossarm on the

tripod or the mast. If installing the mounting bracket on a vertical pole, ensure the pole is

truly vertical.

4. Secure the mounting bracket to the crossarm or vertical pole using the hardware included

with the mounting bracket. The CM255 uses one U-bolt, nuts, flat washers, and lock wash-

ers to mount the bracket, as shown in the following figure.

5. For the CM255LS bracket, use the two set screws to secure the bracket to the crossarm or

pole as shown in the following figure. For pyranometers mounted horizontally, ensure the

mounting bracket is horizontal in two dimensions. For pyranometers mounted at an angle,

SR20-D2 ISO Secondary Standard Pyranometer 2

set the mounting bracket angle to the desired angle prior to tightening the mounting hard-

ware.

6. Verify mounting hardware is firmly tightened, and that the mounting bracket is at the

desired angle. The CM255LS includes leveling bolts for additional adjustment of the pyrano-

meter level.

3. SR20-D2 wiring

Table 3-1: Pin-out, wire color, function, and data logger connection

Wire color

Pin out

Function Data logger connection

-PT -PW

Green 5 2 RS-485A A-, C (odd)

White 7 4 RS-485B B+, C (even)

Red 2 1 Power in (12 V) 12V

Black 6 3 Power ground G

Clear 9 5 Shield ⏚ (analog ground)

Assumes the sensor directly connects to the data logger.

SR20-D2 ISO Secondary Standard Pyranometer 3

3. RS-485 default configuration

The default RS-485 settings are: 19200 baud rate, 8 data bits, even parity, one stop bit. This con-

figuration is used for most Modbus networks.

4. SR20-D2 register map

Table 4-1 (p. 4) provides the register map for the most commonly used values. A comprehensive

Table 4-1: RS-485 register map

Starting

Number

Count

Data Format Units Description

1 1 Signed 16 bit integer Modbus address

3 2 Signed32bitinteger mW/m

Irradiance (temperature

compensated signal)

5 2 Signed32bitinteger mW/m

Irradiance (temperature

uncompensated signal)

7 1 Signed 16 bit integer 0.01 °C Sensor body temperature

8 1 Signed 16 bit integer x 0.1 Ω Sensor electrical resistance

9 1 Signed 16 bit integer Scaling factor irradiance

10 1 Signed 16 bit integer Scaling factor temperature

11 2 Signed 32 bit integer nV Sensor voltage output

41 1 Signed 16 bit integer Serial number

42 2 Float µV/W/m

Sensor sensitivity

47 2 Signed 32 bit integer Calibration date

99 1 Signed 16 bit integer x 0.01 % Humidity

SR20-D2 ISO Secondary Standard Pyranometer 4

5. RS-485 programming

The RS-485 output can be directly read by a MeteoPV, CR6-series, CR1000X-series, or Modbus

RTU RS-485 network. Other Campbell Scientific data loggers can use an MD485 multidrop inter-

face to read the RS-485 output. Refer to the MD485 manual for information about using the

MD485.

A CR6 or CR1000X data logger programmed as a Modbus Master can retrieve the values stored in

the Input Registers. To do this, the CRBasic program requires a SerialOpen() instruction fol-

lowed by the ModbusMaster() instruction.

The SerialOpen instruction has the following syntax:

SerialOpen (ComPort, Baud, Format, TXDelay, BufferSize, Mode)

The Format is typically set to logic 1 low; even parity, one stop bit, 8 data bits. The Mode

parameter should configure the ComPort as RS-485 half-duplex, transparent. The

ModbusMaster() instruction has the following syntax:

ModbusMaster (Result, ComPort, Baud, Addr, Function, Variable, Start, Length,

Tries, TimeOut, [ModbusOption])

The Addr parameter must match the sensor Modbus address. To collect all of the values, the

Start parameter needs to be 1 and the Length parameter needs to correspond with the

sensor type (see SR20-D2 register map (p. 4)). ModbusOption is an optional parameter

described in the CRBasic Editor Help. Refer to example program section for more information.

6. SR20-D2 example program

Table 6-1: Wiring for example program

Wire color Function Data logger connection

Green RS-485A C5

White RS-485B C6

Red Power in (12 V) 12V

SR20-D2 ISO Secondary Standard Pyranometer 5

Table 6-1: Wiring for example program

Wire color Function Data logger connection

Black Power ground G

Clear Shield ⏚ (analog ground)

CRBasic Example 1: CR1000X program for measuring the SR20-D2

'CR1000X Series Datalogger

'Hukseflux SR20-D2 Pyranometer

'SR20 is a ISO 9060 Secondary Standard digital pyranometer

'D2 uses Modbus RS-485 protocol

'PN 34088 SR20-D2CBL-L (CSI's SR20D2 Cable)

Dim SR20D2(15) As Long

Public SR20D2_IRR_TC 'Temperature compensated x 0.01 W/M^2

Public SR20D2_IRR 'Uncompensated x 0.01 W/M^2

Public SR20D2_BodyTemp As Float

Public SR20D2_SerialNumber As Float

Public SR20D2_CalDate As Long

Public SR20D2_Humidity As Float

Public SR20D2_ScaleFactor_IRR As Long

Public SR20D2_ScaleFactor_BodyTemp As Long

Public SR20D2_ElecResistance As Long

Public SR20D2_VoltageOut As Float

Public ModbusResult_IRR_TC

Public ModbusResult_IRR

Public ModbusResult_BodyTemp

Public ModbusResult_SN

Public ModbusResult_CalDate

Public ModbusResult_Humidity

Public ModbusResult_SFIRR

Public ModbusResult_SRTemp

Public ModbusResult_ElecRes

Public ModbusResult_VoltOut

Units SR20D2_IRR = W/m^2

Units SR20D2_IRR_TC = W/m^2

Units SR20D2_BodyTemp = DegC

Units SR20D2_Humidity = %

Units SR20D2_ElecResistance = Ohm

Units SR20D2_VoltageOut = uV

DataTable (OneMin,1,-1)

DataInterval (0,1,Min,10)

Average (1,SR20D2_IRR,IEEE4,False)

Average (1,SR20D2_IRR_TC,IEEE4,False)

Maximum (1,SR20D2_IRR_TC,IEEE4,False,False)

Minimum (1,SR20D2_IRR_TC,IEEE4,False,False)

SR20-D2 ISO Secondary Standard Pyranometer 6

CRBasic Example 1: CR1000X program for measuring the SR20-D2

StdDev (1,SR20D2_IRR_TC,IEEE4,False)

Average (1,SR20D2_BodyTemp,IEEE4,False)

EndTable

DataTable (SR20D2_MetaData,1,-1)

Sample (1,SR20D2_ElecResistance,IEEE4)

Sample (1,SR20D2_VoltageOut,IEEE4)

Sample (1,SR20D2_Humidity,IEEE4)

EndTable

DataTable (SR20D2_SensorID,1,100)

Sample (1,SR20D2_SerialNumber,FP2)

Sample (1,SR20D2_CalDate,Long)

Sample (1,SR20D2_ScaleFactor_IRR,FP2)

Sample (1,SR20D2_ScaleFactor_BodyTemp,FP2)

EndTable

BeginProg

SerialOpen (ComC5,19200,2,0,50,4)

ModbusMaster (ModbusResult_SN,ComC5,19200,53,4,SR20D2(1),41,1,1,100,3)

'Serial Number

SR20D2_SerialNumber = SR20D2(1)

ModbusMaster (ModbusResult_CalDate,ComC5,19200,53,4,SR20D2(2),47,1,1,100,2)

'Cal Date

SR20D2_CalDate = SR20D2(2)

ModbusMaster (ModbusResult_SFIRR,ComC5,19200,53,4,SR20D2(3),9,1,1,100,3)

'Scaling Factor IRR

SR20D2_ScaleFactor_IRR = SR20D2(3)

ModbusMaster (ModbusResult_SRTemp,ComC5,19200,53,4,SR20D2(4),10,1,1,100,3)

'Scaling Factor Temp

SR20D2_ScaleFactor_BodyTemp = SR20D2(4)

ModbusMaster (ModbusResult_ElecRes,ComC5,19200,53,4,SR20D2(10), _

8,1,1,100,1)

'Electrical Resistance

SR20D2_ElecResistance = SR20D2(10)/10

ModbusMaster (ModbusResult_VoltOut,ComC5,19200,53,4,SR20D2(11), _

11,2,1,100,2)

'Voltage output

SR20D2_VoltageOut = SR20D2(11)

ModbusMaster (ModbusResult_Humidity,ComC5,19200,53,4,SR20D2(13),99,1,1,100,3)

'Humidity

SR20D2_Humidity = SR20D2(13)/100

Scan (1,Sec,0,0)

ModbusMaster (ModbusResult_IRR_TC,ComC5,19200,53,4,SR20D2(5),3,2,1,100,2)

'Irradiance temperature compensated

SR20D2_IRR_TC = SR20D2(5)/SR20D2_ScaleFactor_IRR

ModbusMaster (ModbusResult_IRR,ComC5,19200,53,4,SR20D2(7),5,2,1,100,2)

'Irradiance uncompensated

SR20D2_IRR = SR20D2(7)/SR20D2_ScaleFactor_IRR

ModbusMaster (ModbusResult_BodyTemp,ComC5,19200,53,4,SR20D2(9),7,1,1,100,1)

SR20-D2 ISO Secondary Standard Pyranometer 7

CRBasic Example 1: CR1000X program for measuring the SR20-D2

'Body Temp

SR20D2_BodyTemp = SR20D2(9)/SR20D2_ScaleFactor_BodyTemp

CallTable OneMin

NextScan

SlowSequence

Scan (6,Hr,0,0)

ModbusMaster (ModbusResult_ElecRes,ComC5,19200,53,4,SR20D2(10),8,1,1,100,1)

'Electrical Resistance

SR20D2_ElecResistance = SR20D2(10)/10

ModbusMaster (ModbusResult_VoltOut,ComC5,19200,53,4,SR20D2(11), _

11,2,1,100,2)

'Voltage output

SR20D2_VoltageOut = SR20D2(11)

ModbusMaster (ModbusResult_Humidity,ComC5,19200,53,4,SR20D2(13), _

99,1,1,100,3)

'Humidity

SR20D2_Humidity = SR20D2(13)/100

CallTable SR20D2_MetaData

NextScan

SlowSequence

Scan (1,Sec,0,1)

If SR20D2_SerialNumber = 0 Then

ModbusMaster (ModbusResult_SN,ComC5,19200,53,4,SR20D2(1),41,1,1,100,3)

'Serial Number

SR20D2_SerialNumber = SR20D2(1)

ModbusMaster (ModbusResult_CalDate,ComC5,19200,53,4,SR20D2(2), _

47,1,1,100,2)

'Cal Date

SR20D2_CalDate = SR20D2(2)

ModbusMaster (ModbusResult_SFIRR,ComC5,19200,53,4,SR20D2(3),9,1,1,100,3)

'Scaling Factor IRR

SR20D2_ScaleFactor_IRR = SR20D2(3)

ModbusMaster (ModbusResult_SRTemp,ComC5,19200,53,4,SR20D2(4),10,1,1,100,3)

'Scaling Factor Temp

SR20D2_ScaleFactor_BodyTemp = SR20D2(4)

ModbusMaster (ModbusResult_ElecRes,ComC5,19200,53,4,SR20D2(10), _

8,1,1,100,1)

'Electrical Resistance

SR20D2_ElecResistance = SR20D2(10)/10

ModbusMaster (ModbusResult_VoltOut,ComC5,19200,53,4,SR20D2(11), _

11,2,1,100,2)

'Voltage output

SR20D2_VoltageOut = SR20D2(11)

ModbusMaster (ModbusResult_Humidity,ComC5,19200,53,4,SR20D2(13), _

99,1,1,100,3)

'Humidity

SR20D2_Humidity = SR20D2(13)/100

SR20-D2 ISO Secondary Standard Pyranometer 8

CRBasic Example 1: CR1000X program for measuring the SR20-D2

EndIf

CallTable SR20D2_SensorID

NextScan

EndProg

7. Maintenance and

troubleshooting

The pyranometer has no service items requiring scheduled replacement. There is no accessible

desiccant cartridge to maintain. Use pure alcohol or distilled water and a lint-free cloth to clean

the dome, ensuring no smears or deposits are left on the dome. Local conditions and application

dictate cleaning interval. Sophisticated research applications require daily cleaning. For typical

PV applications, clean once per week, bi-monthly, or monthly. The pyranometer should be recal-

ibrated following industry standard best practices such as ASTM G167, ISO 9846, ASTM E824 or

ASTM G207 by an accredited lab. The recommended recalibration interval is two years. Contact

Campbell Scientific for more information.

Unexpected results typically occur because of improper wiring or programming, electromagnetic

radiation, or damaged cables. Ensure that the data logger program includes the correct para-

meters for the measurement instructions. Check for the presence of strong sources of elec-

tromagnetic radiation and use the 50 or 60 Hz integration option in the data logger program if

electromagnetic radiation can be a problem. Check the cable for damage and ensure that it is

properly connected to the data logger.

SR20-D2 ISO Secondary Standard Pyranometer 9

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Campbell Scientific SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer Owner's manual

Brand: Campbell Scientific

Model: SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer

Type: Owner's manual

This manual is also suitable for

SR20-D2

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Campbell Scientific SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer Owner's manual

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Campbell Scientific SR20-D2 ISO Spectrally Flat Class A (Secondary Standard) Pyranometer Owner's manual

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